... I don't notice a difference using raw input and turning it off. Do you guys?

If you have a mouse fix installed you probably won't, although if your fps fluctuates a lot, WM_MOUSEMOVE is very inconsistent in comparison to WM_INPUT. In source, I was able to avoid any negative acceleration by capping my FPS @ 301 for 75hz and 201 for 100hz.

IE: If you couldn't keep a high FPS, you were prone to negative acceleration. If you didn't disable windows acceleration (mousefix), you were then prone to positive acceleration. To solve this, you would have to produce/cap your FPS high and install a mousefix to avoid any problems. I'm guessing Valve/Turtle Rock Studios thought the pos+neg accel would balance out

Edit: I also forgot to mention that mice with a DPI of over 2k~ are prone to enormous amounts of negative acceleration due to the way WM_MOUSEMOVE responds/reacts. direct/raw input also solves this issue.Edited by Skylit - 11/30/10 at 7:10pm

I suppose I move with my wrist. How exactly would you do it the other way xD?

So if 1.00 is off, why check it on? Isn't off or 1.00 the same thing?

I have not used a mouse fix for windows (I used to but I system recovered after getting stability issues) and I cap TF2's fps at 59.9 to avoid V Sync lag.

I have no clue what grips are which. I don't own a G9x lol.

Arm based movement can be done with a mainly palm and sometimes claw grip. Opposed to putting pressure on the pad and moving the mouse left to right with your wrist, you let the mouse flow freely from left to right with your arm.

I really don't know how they coded this, but I leave it on 1.00 to make sure it's off completely. The way they described it is either misleading/incorrect.

Due to direct input, you won't need a mouse fix, but if you're still getting tearing, I recommend that you cap your FPS at 121 (or 241 preferred if your video card can keep up) since it's a multiple of 60(hz).

So my arm must be lifted? Feels sorta awkward, how or am I over doing it?

No, but it's one of those things I'll have a terrible time explaining

Maybe someone here on OCN will do a better job lol

You should play with what you're familiar with. As for your lifting problem, I can't really help you. You can either play with spazzy high sens movements or occasionally lift, but be able to control your mouse.